Thomas F Belletete

US Patent:

56867271, Nov 11, 1997

Filed:

Sep 27, 1995

Appl. No.:

8/534546

Inventors:

Arthur Reenstra - Summerfield NC
Wende Reenstra - Boston MA
Thomas Belletete - Winchendon MA
Curtis A. Vock - Salem MA

Assignee:

SeeUV - Salem MA

International Classification:

G01J 510

US Classification:

250372

Abstract:

An ultraviolet radiation detection exposure system determines either ultraviolet flux or accumulated ultraviolet energy. A detector converts the ultraviolet radiation into voltage, and a voltage-to-frequency converter provides a corresponding frequency. If the system measures flux, a conversion subsystem converts the frequency to an associated ultraviolet flux in watts. If the sensor measures ultraviolet energy over a period of time, a counter counts at the frequency of the voltage-to-frequency converter thereby integrating the received ultraviolet energy at the detector. A reset button allows the user to reset the system, clearing the counter, prior to entering the sun for the day. A warning light, display, or buzzer indicates to the user of the system that her skin is in danger of receiving a sun burn. A plurality of fibers and/or lambertian half-spheres are used to provide substantially uniform solar acceptance.